Writing more than 128 bytes to stdout gets stuck

[jjscout]

Hello
i'm working on a ESP32s3 processor
when trying to write more than 128 bytes at a time to STDOUT(print statements/logs) the write operation apeears to jam for a significant amount of time, ~10ms for each 128 bytes.
Splitting into 128 byte chunks and waiting for ~1.4ms(which is approximately the time to send 128 bytes at a 921600 baud rate) gets around the issue.
Is there a more organized solution to this? using uselect did not yield an improvement
maybe some buffer that can be increased?
Thanks

[jjscout]

After further investigation I see that i'm blocked at a semaphore inside uart_stdout_tx_strn

int uart_stdout_tx_strn(const char *str, size_t len) {
    uart_hal_context_t repl_hal = REPL_HAL_DEFN();
    size_t remaining = len;
    uint32_t written = 0;
    // TODO add a timeout
    for (;;) {
        uart_hal_write_txfifo(&repl_hal, (const void *)str, remaining, &written);

        if (written >= remaining) {
            break;
        }
        remaining -= written;
        str += written;
        ulTaskNotifyTake(pdFALSE, 1);
    }
    return len;
}

the write is limited to 128 bytes and if the total size is above that i'm blocked at ulTaskNotifyTake for ~10ms

[cnadler86]

I tried to implement a repl logger for the built in esp32 log information, but it crashed in some ocations systematically. I didn't investigate any further but might be related to your issue. I will try to dig here here deeper. Thanks for the information.